new landlord, with issues already, need help!!

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Dear all,

I just got my first rental property rented out. They are moving in this coming Sat. Today, the agent called, telling me the tenant want me to install garage door opener and spinkler system. They signed the lease already without those, now they are asking for them and said they would sign 2 year lease if I install them. Should I do it? Also, another question, the rent is $1450, my mortgage is about $820, Tax is about $410 per month(yeahh, it's Texas), HOA+insurance is $90, cash flow is $130, does it sound like a good investment to you?

Thx a lot for your input!!

Nicole